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Direct-write liquid phase transformations with a scanning transmission electron microscope

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C6NR04994J· OSTI ID:1333640

The highly energetic electron beam from a scanning transmission electron microscope (STEM) can induce local changes in the state of matter, ranging from local knock-out and atomic movement, to amorphization/crystallization, and chemical/electrochemical reactions occuring at localized liquid-solid and gas-solid interfaces. To date, fundamental studies of e-beam induced phenomena and practical applications have been limited by conventional e-beam rastering modes that allow only for uniform e-beam exposures. Here we develop an automated liquid phase nanolithography method that is capable of directly writing nanometer scaled features within silicon nitride encapsulated liquid cells. An external beam control system, connected to the scan coils of an aberration-corrected STEM, is used to precisely control the position, dwell time, and scan velocity of a sub-nanometer STEM probe. Site-specific locations in a sealed liquid cell containing an aqueous solution of H2PdCl4 are irradiated to controllably deposit palladium onto silicon nitride membranes. We determine the threshold electron dose required for the radiolytic deposition of metallic palladium, explore the influence of electron dose on the feature size and morphology of nanolithographically patterned nanostructures, and propose a feedback-controlled monitoring method for active control of the nanofabricated structures through STEM detector signal monitoring. As a result, this approach enables both fundamental studies of electron beam induced interactions with matter, as well as opens a pathway to fabricate nanostructures with tailored architectures and chemistries via shape-controlled nanolithographic patterning from liquid phase precursors.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1333640
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 34 Vol. 8; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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  • Utke, Ivo; Hoffmann, Patrik; Melngailis, John
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Cited By (5)

Resolution and aberration correction in liquid cell transmission electron microscopy journal December 2018
Atom-by-atom fabrication with electron beams journal June 2019
In situ study of nucleation and growth dynamics of Au nanoparticles on MoS 2 nanoflakes journal January 2018
The radiation chemistry of focused electron-beam induced etching of copper in liquids journal January 2019
Resolution and aberration correction in liquid cell transmission electron microscopy collection January 2018

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